1 #include "llvm/ADT/OwningPtr.h"
2 #include "llvm/Bitcode/ReaderWriter.h"
3 #include "llvm/IR/Function.h"
4 #include "llvm/IR/GlobalVariable.h"
5 #include "llvm/IR/LLVMContext.h"
6 #include "llvm/IR/Module.h"
7 #include "llvm/Support/CommandLine.h"
8 #include "llvm/Support/ManagedStatic.h"
9 #include "llvm/Support/MemoryBuffer.h"
10 #include "llvm/Support/raw_ostream.h"
11 #include "llvm/Support/system_error.h"
12 #include "llvm/Support/ToolOutputFile.h"
13 #include "llvm/Config/config.h"
14 
15 using namespace llvm;
16 
17 static cl::opt<std::string>
18 InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
19 
20 static cl::opt<std::string>
21 OutputFilename("o", cl::desc("Output filename"),
22                cl::value_desc("filename"));
23 
24 int main(int argc, char **argv) {
25   LLVMContext &Context = getGlobalContext();
26   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
27 
28   cl::ParseCommandLineOptions(argc, argv, "libclc builtin preparation tool\n");
29 
30   std::string ErrorMessage;
31   std::auto_ptr<Module> M;
32 
33   {
34     OwningPtr<MemoryBuffer> BufferPtr;
35     if (error_code ec = MemoryBuffer::getFileOrSTDIN(InputFilename, BufferPtr))
36       ErrorMessage = ec.message();
37     else
38       M.reset(ParseBitcodeFile(BufferPtr.get(), Context, &ErrorMessage));
39   }
40 
41   if (M.get() == 0) {
42     errs() << argv[0] << ": ";
43     if (ErrorMessage.size())
44       errs() << ErrorMessage << "\n";
45     else
46       errs() << "bitcode didn't read correctly.\n";
47     return 1;
48   }
49 
50   // Set linkage of every external definition to linkonce_odr.
51   for (Module::iterator i = M->begin(), e = M->end(); i != e; ++i) {
52     if (!i->isDeclaration() && i->getLinkage() == GlobalValue::ExternalLinkage)
53       i->setLinkage(GlobalValue::LinkOnceODRLinkage);
54   }
55 
56   for (Module::global_iterator i = M->global_begin(), e = M->global_end();
57        i != e; ++i) {
58     if (!i->isDeclaration() && i->getLinkage() == GlobalValue::ExternalLinkage)
59       i->setLinkage(GlobalValue::LinkOnceODRLinkage);
60   }
61 
62   if (OutputFilename.empty()) {
63     errs() << "no output file\n";
64     return 1;
65   }
66 
67   std::string ErrorInfo;
68   OwningPtr<tool_output_file> Out
69   (new tool_output_file(OutputFilename.c_str(), ErrorInfo,
70 #if LLVM_VERSION_MAJOR > 3 || (LLVM_VERSION_MAJOR == 3 && LLVM_VERSION_MINOR > 3)
71                         sys::fs::F_Binary));
72 #else
73                         raw_fd_ostream::F_Binary));
74 #endif
75   if (!ErrorInfo.empty()) {
76     errs() << ErrorInfo << '\n';
77     exit(1);
78   }
79 
80   WriteBitcodeToFile(M.get(), Out->os());
81 
82   // Declare success.
83   Out->keep();
84   return 0;
85 }
86 
87